The conjugation of the verb to do only uses the form "does" for the third-person singular, present tense. That is, for a singular noun or the pronouns he, she, or it. All other present tense forms use "do".
Examples:
I wish that I could do it just the way that he does it.
I do it every day. You do it every day. We do it every day. They do it every day.
But he also does it every day, she does it every day, and even her dog does it every day. (We all breathe.)
i do not know how to use embalming in a sentence. (there is the sentence)
So- you are asking when to use 'when' in a sentence. When you are asking how to use when in a question, you are already using when in a sentence, because a question actually is a sentence. I like to use when in a sentence whenever I like.
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Use it in a big sentence.
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